What?!? That's Coke's new "Coca-Cola Life" drink. Available in Chile and Argentina and coming soon in the U.K., it has 89 calories (versus regular Coke's 140) and is sweetened with something called "stevia."
Green is widely known as the color of broccoli and other vegetables.
If stevia turns out to be a vegetable, I don't even know what I'm gonna do.